1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4197fa78b3ef69bd5d9dc0a051f48c2a607bd28a5b2afa5eb6673fd831904f09. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2576fce8-bb99-4eaa-947a-a1e9b4acad76.json and https://artists.proofprofile.net/proofs/artist/2576fce8-bb99-4eaa-947a-a1e9b4acad76.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Étude No. 5 (arr. of F. Sor: 24 Very Easy Exercises Op. 35 No. 22)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559c9cfe6a6dc5911f697377fb32e45727296fd911b994d2b5e0c80ad0f82cb4. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ720739701.
Etude No. 6 (arr. of F. Sor: 24 Very Easy Exercises Op. 35 No. 17)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea09605db79eabf3644bf50785343cb31f7a24c1bcd6cbe5670227315dcf498a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ720739702.
Étude No. 13: Andante (Arr. by Roland Dyens)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc71669f79972863794f5080aab9195828518da8c3d81024f33728d22260b2477. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ720739704.
Étude No. 19: Allegretto (Arr. by Roland Dyens)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664168b4186dcdbfb0ac0c58b45301685e73c4307dd004e7b8b66e06b5945602. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ720739706.
Étude No. 1: Maestoso (Arr. by Roland Dyens)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd7b81f6284355c5d3b0455fdea469788cb7d36509e07b0956a7af5ddb590be. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ720739707.
Étude No. 17: Andante (Arr. by Roland Dyens)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x401d73b90f925ac887f1242087fc6c33162ac30c08970b00582e2597a62b8dc4. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ720739705.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Étude No. 20: Marciale (Arr. by Roland Dyens)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x445c12cb09bc2228a38459ee4889f6a57bea3f98c62457e1a2a14e070b17d572. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ720739708.
Rossiniana No. 1, Op. 119, "Sur des thèmes d'opéra de Gioachino Rossini" (Arr. by Roland Dyens)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb43750b5ceb2bf4ebde2120c0ac21d1ac8e85638c0c849eccc2765ba1ff2416f. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ720739710.